After upgrading to 12.04 (it was done by a complete reinstallation), bluetooth doesn't work anymore. Before (I think it was Ubuntu 11.04), I just followed instructions on this page and copied /lib/firmware/ath3k-2.fw to /lib/firmware/ath3k-1.fw and everything was fine.

But in 12.04, there isn't any ath3k-2.fw in the /lib directory, so this method is not possible. Also, pressing Fn+F3 doesn't work. I would appreciate any help.

Some further information (I hope it's enough):

    dmesg
[   23.063710] Bluetooth: Core ver 2.16
[   23.063740] NET: Registered protocol family 31
[   23.063743] Bluetooth: HCI device and connection manager initialized
[   23.063746] Bluetooth: HCI socket layer initialized
[   23.063747] Bluetooth: L2CAP socket layer initialized
[   23.063972] Bluetooth: SCO socket layer initialized
[   23.066930] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[   23.066934] Bluetooth: BNEP filters: protocol multicast
[   23.068422] Bluetooth: RFCOMM TTY layer initialized
[   23.068428] Bluetooth: RFCOMM socket layer initialized
[   23.068430] Bluetooth: RFCOMM ver 1.11

lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 003: ID 046d:c05f Logitech, Inc.
Bus 002 Device 004: ID 046d:c31c Logitech, Inc. Keyboard K120 for Business
Bus 002 Device 005: ID 0402:9665 ALi Corp. Gateway Webcam

hcitool dev
Devices: